MINERALOGY. 461 



Fyrrhoarsenite. — xV new arseniiitc of manganese described by IgcUtrOrn, 

 and related to numerous hydrated ar.>eniates of manganese, several of 

 which (polyars^^nite, xanthoarseuite, chondroarsenite) have been nam':>(l 

 by the same author. It occurs at the Sjo mi!u\s in the Grytliyttan 

 parish, Sweden, forming small veins and masses with tephroite, calcite, 

 hausmannite, barite. It shows one cleavage, but has not yet been found 

 in crystals. Optically it is singly refracting for the most part, with oc- 

 casional anisotropic portions. The hardness is 4. The color is a yel- 

 lowish red (hence the name from r.oppoq, firc^ i. e., fire-red), resembling 

 l)otassium dichromate. It dissolves readily in hydrochloric and nitric 

 acids. An analysis .yielded : 



As205(Sb205) MnO CaO MgO SiOz AI2O3, FeO 



'58.06 17.9G 18.68 3.58 igiiitiou 0.85 1.02, tr. =100.15 



The formula given is 3(Mn, Ca, Mg)0. As2(Sb2)05. 



Schungitc. — A name given (1884) by A. von Inostranzefif to a form of 

 amorphous carbon found in the crystalline schists of Schunga, in the 

 Oleuetzer government, Kussia. It is the same substance that was 

 named graphitoid by Sauer, as noted in the report for 1885. 



Stilvenite. — A new alum occurring v.ith other related minerals at 

 tlie abandoned mine of Alcaparroso, near Copiapo, Chili, described by 

 Darapsky. It occurs in slender acicular crystals 2 or 3 inches in length. 

 An analysis yielded (mean of two) : 



corresponding to (Na-z, Mg)S04+Al2S30i24-24H20. The name is given 

 after the mining engineer, Enrique Stiiveu. 



BRIEF REFERENCES TO PAPERS UPON MINERAL SPECIES, 1886.* 



Agalmatolite. Rosshire, Scotland, analysis, Macadam, Min. Mag., vii, 74. 



Scotland, composition discussed, Bell, Min. Mag., vii, 24. 

 Albkrtite. Scotland, occurrence, Honeymann, Min. Mag., vii, 77. 

 Albite. Kasbok, Caucasus, crystallograpliic, optical, and chemical investigation, 

 Schuster, Min. petr. Mitth., vii, 373. 

 Stanislaus mine, Calaveras Coanty, California, crystals described, A. W. Jackson, 



Proc. Cal. Acad. Sc, No. 4, p. 368. 

 Norway, optical examination, Lacroix, Bull. Soc. Min., ix, 131. 

 Litchfield, Maine, analysis, F. W. Clarke, Am. J. S'"-., xxxi, 268. 

 Andreasberg, var. zygadite examined, Krenner, analysis by Loczka, Zs. Kr., xi, 25'J. 

 Allactite. Laugbau, Sweden, occurrence, A. Sjogren, Geol. For. Fiirh., vm, 473. 

 Allaxite. Var. orthite, containing a supposed new element, austrium, E. Linnc- 

 mann, C. R., June 21, vol. ci. 

 Devil's Head Mountain, Douglas County, Colorado, analysis, L. G. Eakins, Proc. 

 Col. Sc. Soc, 11,32. 

 Alstoxite. Sec Bromlite. 



Alum. Occurrence and composition of Chilian varieties, Darapsky, Verh. wiss. Ver. 

 Santiago, 3, 105 ei scf/. • 



* A few papers belonging to 1885, but omitted in the last report, are included here. 



